Module org.freedesktop.cairo

Package io.github.jwharm.cairobindings

Class Interop

java.lang.Object

io.github.jwharm.cairobindings.Interop

public final class Interop
extends Object

The Interop class contains functionality for interoperability with native code.

Method Summary

Modifier and Type	Method	Description
static MemorySegment	allocateNativeString(String string, SegmentAllocator allocator)	Allocate a native string using SegmentAllocator.allocateUtf8String(String).
static MethodHandle	downcallHandle(String name, FunctionDescriptor fdesc)	Creates a method handle that is used to call the native function with the provided name and function descriptor.
static <T extends Enum<T> & Flag> int	enumSetToInt(Set<T> set)	Create a bitfield from the provided Set of enums
static <T extends Enum<T> & Flag> EnumSet<T>	intToEnumSet(Class<T> cls, Function<Integer,T> make, int bitfield)	Create an EnumSet of class `cls` from the provided bitfield

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

downcallHandle

public static MethodHandle downcallHandle(String name,
 FunctionDescriptor fdesc)

Creates a method handle that is used to call the native function with the provided name and function descriptor. The method handle is cached and reused in subsequent lookups.

Parameters:

name - Name of the native function

fdesc - Function descriptor of the native function

Returns:

the MethodHandle

allocateNativeString

public static MemorySegment allocateNativeString(String string,
 SegmentAllocator allocator)

Allocate a native string using SegmentAllocator.allocateUtf8String(String).

Parameters:

string - the string to allocate as a native string (utf8 char*)

allocator - the segment allocator to use

Returns:

the allocated MemorySegment

intToEnumSet

public static <T extends Enum<T> & Flag> EnumSet<T> intToEnumSet(Class<T> cls,
 Function<Integer,T> make,
 int bitfield)

Create an EnumSet of class `cls` from the provided bitfield

Type Parameters:

T - an enum implementing the Java-GI Enumeration interface

Parameters:

cls - the class of the enum

make - function that will construct an enum from one flag value

bitfield - the integer containing the bitfield

Returns:

an EnumSet containing the enum values as set in the bitfield

enumSetToInt

public static <T extends Enum<T> & Flag> int enumSetToInt(Set<T> set)

Create a bitfield from the provided Set of enums

Type Parameters:

T - an enum implementing the Java-GI Enumeration interface

Parameters:

set - the set of enums

Returns:

the resulting bitfield